Provided they are mechanical in operation, there should be no reason for them to.
No they don't cause breast cancer
If you have breast cancer and receiving chemotherapy then you cannot breastfeed your baby.
No they do not.
No it can not.
No
No...you can lay anyway you want...it wouldn't cause breast cancer
No.
Estrogen doesn't cause breast cancer but certainly estrogen can be linked to breast cancer. This is why hormonal birth control such as the combination pill is strongly linked to breast cancer.
No
Extreme horniness... or breast cancer.
No, it has no effect on developing cancer.
Some causes of breast cancer are obesity, nullipara, not breastfeeding and familial history of breast CA.